Authoritative source of information on Psychological Operations (PSYOP) or as it is now called Military Information Support Operations (MISO). Written by a retired senior Army Officer and former Honorary Colonel of the PSYOP Regiment.

The implication is that the EU is concerned that Britain
would employ unfair means to learn about the plans and intentions of the EU
team. Is it possible to interpret this in another way?

Increased security efforts reflect a fear that the ‘enemy’
is gaining an advantage in the ‘battle’. In this case the battle is over the
terms of the British exit from the EU.

In other situations, Venezuela for instance, increased
actions against opponents are often cloaked in security terms when the real
motivation is that the enemy force is winning the influence battle in the mind
of public opinion.